FGR 95 for latex masks

I have been doing a lot of side jobs doing large scale bronze figure molding. I have been using FGR 95 hydrocal reinforced with fiberglass and have been impressed with the lightness and strength of the final molds.(they are mother molds for urethane) The FGR 95 is also mixed with a 3:1 ratio of water/VF-812 polymer to give extra plasticity. My question is, has any one used this product to make lighter weight pull-over latex mask molds? Of ours with a splash coat followed by the fiberglass reinforcement. Probably no polymer, as it may interfere with water absorption from the latex. Nerd question, needs a nerd answer.